제출 #407016

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
407016		LptN21	Baloni (COCI15_baloni)	C++14	0 / 100	2079 ms	11996 KiB

baloni

#include <bits/stdc++.h>
using namespace std;
#define fastIO ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL);
#define FF first
#define SS second
#define pb push_back
#define sz(x) (int)x.size()
#define oo 1e9
#define eps 1e-9
#define PI acos(-1.0)
#define lb lower_bound
#define ub upper_bound
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> ii;
const int N = 1e6+7, M=1000+7;
const int MOD = 1e9+7;

int n, m, k, t;

int a[N], prv[N];
bool mark[N];

signed main() {
    //freopen("test.inp", "r", stdin);
    //freopen("test.out", "w", stdout);
    //fastIO;
    scanf("%d", &n);
    int ans=0;memset(prv, 0, sizeof prv);
    for(int i=1;i<=n;mark[i++]=0) scanf("%d", &a[i]);
    for(int j, i=n;i>0;i--)
        j=prv[a[i]-1], prv[a[i]]=i, a[i]=j;
    for(int j, i=1;i<=n;i++) {
        if(mark[i]) continue;
        ans++, j=a[i];
        while(j) mark[j]=1, j=a[j];
    }
    printf("%d", ans);
    return 0;
}
/* stuff you should look for
    - int overflow, array bounds
    - special cases (n=1?)
    - do smth instead of do nothing and stay organized
    - WRITE STUFF DOWN
    - DONT JUST STICK ON ONE APPROACH
*/

컴파일 시 표준 에러 (stderr) 메시지

baloni.cpp: In function 'int main()':
baloni.cpp:28:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
baloni.cpp:30:40: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |     for(int i=1;i<=n;mark[i++]=0) scanf("%d", &a[i]);
      |                                   ~~~~~^~~~~~~~~~~~~

• Subtask 1: 0 / 100